JP6906657B1 - Electromagnetic switch device for starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic switch device for a starter provided with a switch cap capable of achieving both tracking resistance and heat resistance. SOLUTION: A pair of fixed contacts 7, a movable contact 8, a motor terminal 7c connected to one fixed contact 7a, a battery terminal 7d connected to the other fixed contact 7b, a movable contact and a pair of fixed contacts. It includes a first switch cap 25 that houses the contacts inside, and a second switch cap 26 that penetrates and fixes the motor terminal and the battery terminal. The first switch cap is made of a thermosetting resin, and the second switch cap is a polyamide resin, an aromatic polyimide resin, a cyclic aliphatic epoxy resin, a polyester resin, a modified polyphenylene ether resin, an amino resin, and a polyurethane resin. , Polybutylene terephthalate resin and polyphenylene sulfide resin, which are composed of at least one resin selected from the group. [Selection diagram] Fig. 4

Description

The present application relates to an electromagnetic switch device for a starter.

The car is equipped with a starter to start the engine. The starter transmits the power of the starter's motor to the engine to start the engine. An electromagnetic switch device for the starter for starting the motor of the starter in response to the on operation of the key switch is connected to the starter.

The electromagnetic switch device for the starter includes a motor terminal connected to the motor of the starter and a battery terminal connected to the battery. A pair of fixed contacts arranged apart from each other and a movable contact for electrically connecting the pair of fixed contacts based on a start signal are provided between the motor terminal and the battery terminal. The electromagnetic switch device for a starter supplies battery power to a motor by operating movable contacts to electrically connect a pair of fixed contacts to each other. Further, the electromagnetic switch device for a starter is provided with a switch cap in which a movable contact and a pair of fixed contacts are housed therein, and the motor terminal and the battery terminal are penetrated and fixed.

Phenol resin, which is a thermosetting resin, is generally used for the switch cap from the viewpoint of electrical insulation, mechanical strength, heat resistance, and the like. Since the battery terminal is connected to the battery, a voltage is constantly applied. Therefore, if moisture or the like intermittently adheres to the battery terminal for a long period of time, tracking may occur in the switch cap between the motor terminal and the battery terminal. Tracking is a phenomenon in which a minute current starts to flow due to the accumulation of dust or moisture between terminals having a potential difference, and a carbonized conductive path (track) is generated on the surface of the switch cap to cause a short circuit between the terminals.

As a countermeasure against trucking in the switch cap, an electromagnetic switch device for a starter in which a protrusion is provided on the switch cap to extend the creepage distance is disclosed (see, for example, Patent Document 1).

Jikkai Sho 59-166337 Gazette

In recent years, there have been strict demands for miniaturization of starters, and there are many restrictions on the installation position of electromagnetic switch devices for starters. If the starter electromagnetic switch device and the starter are in close proximity, or if the starter electromagnetic switch device and other parts on the vehicle side are in close proximity, the conventional tracking measures for the starter electromagnetic switch device are insufficient. there were.

On the other hand, a polyamide resin, which is a thermoplastic resin, is known to have excellent tracking resistance. However, when the switch cap is made of this thermoplastic resin, the inside of the switch cap accommodating the contacts may be deformed or melted due to heat generated during the energization operation of the fixed contacts and the movable contacts. Normally, the starter is used for a short time and the heat generated by the contacts is small. However, the starter may be used continuously in the event of an abnormality such as difficulty in starting the engine. In a switch cap made of thermoplastic resin, when the starter is used continuously, the heat generated by the contacts becomes large, the switch cap becomes hot and melts and deforms, and in the worst case, the battery terminal may fall off. .. As described above, it has been difficult to achieve both tracking resistance and heat resistance with the switch cap of the conventional electromagnetic switch device for starters.

The present application has been made to solve the above-mentioned problems, and an object of the present application is to provide an electromagnetic switch device for a starter provided with a switch cap capable of achieving both tracking resistance and heat resistance.

The electromagnetic switch device for a starter of the present application includes a pair of fixed contacts arranged apart from each other, a movable contact that contacts the pair of fixed contacts based on a start signal and electrically connects the pair of fixed contacts. A motor terminal connected to one fixed contact of a pair of fixed contacts, a battery terminal connected to the other fixed contact of a pair of fixed contacts, a movable contact, and a pair of fixed contacts are housed inside. It includes a first switch cap and a second switch cap that penetrates and fixes the motor terminal and the battery terminal. The first switch cap is made of a thermosetting resin, and the second switch cap is a polyamide resin, an aromatic polyimide resin, a cyclic aliphatic epoxy resin, a polyester resin, a modified polyphenylene ether resin, an amino resin, and a polyurethane resin. , Polybutylene terephthalate resin and polyphenylene sulfide resin, which are composed of at least one resin selected from the group.

The electromagnetic switch device for a starter of the present application includes a first switch cap that internally accommodates a movable contact and a pair of fixed contacts, and a second switch cap that penetrates and fixes the motor terminal and the battery terminal. The switch cap is made of a thermosetting resin, and the second switch cap is a polyamide resin, an aromatic polyimide resin, a cyclic aliphatic epoxy resin, a polyester resin, a modified polyphenylene ether resin, an amino resin, a polyurethane resin, and a polybutylene terephthalate. Since it is composed of at least one resin selected from the group consisting of a resin and a polyphenylene sulfide resin, both tracking resistance and heat resistance can be achieved at the same time.

It is a partial cross-sectional view of the starter which concerns on Embodiment 1. FIG. It is an electric circuit diagram of the starter which concerns on Embodiment 1. FIG. It is an outline drawing of the electromagnetic switch device for a starter which concerns on Embodiment 1. FIG. It is sectional drawing of the electromagnetic switch device for a starter which concerns on Embodiment 1. FIG. It is a partial cross-sectional view of the electromagnetic switch device for a starter which concerns on Embodiment 3. FIG. It is an exploded view of the electromagnetic switch device for a starter which concerns on Embodiment 3. FIG. FIG. 5 is an external view of an electromagnetic switch device for a starter according to a third embodiment.

Hereinafter, the starter and the electromagnetic switch device for the starter according to the embodiment for carrying out the present application will be described in detail with reference to the drawings. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
FIG. 1 is a partial cross-sectional view of the starter according to the first embodiment. The starter 1 of the present embodiment includes an electromagnetic switch device 2 for a starter, a motor 3, a shift lever 4, a shaft 5, and a pinion 6. The starter 1 drives the shift lever 4 when the starter electromagnetic switch device 2 operates in response to the start signal. Then, the starter 1 pushes the pinion 6 connected to the shaft 5 forward via the shift lever 4 to engage the pinion 6 with the ring gear (not shown) of the engine. Further, the starter 1 rotates the motor 3 by passing an electric current through the electromagnetic switch device 2 for the starter. The starter 1 rotates the pinion 6 by the rotation of the motor 3 and transmits power to the engine via the ring gear. In this way, the starter 1 can start the engine.

FIG. 2 is an electric circuit diagram of the starter 1 according to the present embodiment. The starter electromagnetic switch device 2 includes an electromagnetic switch main body 2a and an auxiliary relay 24. The electromagnetic switch main body 2a has a pair of fixed contacts 7, movable contacts 8, suction coils 12, and holding coils 13. The auxiliary relay 24 has a pair of auxiliary relay fixed contacts 15, an auxiliary relay movable contact 16, and an auxiliary relay coil 19. One fixed contact 7a of the pair of fixed contacts 7 is connected to the motor 3 via the motor terminal 7c. The other fixed contact 7b of the pair of fixed contacts 7 is connected to the battery B via the battery terminal 7d. The starter 1 operates the auxiliary relay 24 in response to a start signal output from the control device CA when the key switch SS is turned on. The auxiliary relay 24 supplies electric power to the suction coil 12 and the holding coil 13 of the electromagnetic switch main body 2a by electrically connecting the pair of auxiliary relay fixed contacts 15 with the auxiliary relay movable contact 16. The electromagnetic switch main body 2a drives the shift lever 4 by the electromagnetic force of the suction coil 12 and the holding coil 13, and brings the movable contact 8 into contact with the pair of fixed contacts 7. In this way, the starter 1 supplies electric power from the battery B to the motor 3.
Next, the configuration of the starter electromagnetic switch device 2 will be described in detail.

FIG. 3 is an external view of the starter electromagnetic switch device 2 of the present embodiment. The left side of FIG. 3 is a front view, and the right side of FIG. 3 is a side view. Further, FIG. 4 is a cross-sectional view of the starter electromagnetic switch device 2 on the line AA of FIG. As shown in FIG. 2, the starter electromagnetic switch device 2 includes a pair of fixed contacts 7 that form an electric circuit for supplying electric power from the battery B to the motor 3. One fixed contact 7a is connected to the motor terminal 7c, and the other fixed contact 7b is connected to the battery terminal 7d. Further, the motor terminal 7c is connected to the motor 3, and the battery terminal 7d is connected to the battery B.

As shown in FIG. 4, the starter electromagnetic switch device 2 includes fixed contacts 7a and 7b, movable contacts 8, rods 9, movable iron cores 10, fixed iron cores 11, suction coils 12, holding coils 13 and joint irons 14. There is. The movable contact 8 forms an electric circuit that supplies electric power to the motor 3 by electrically connecting the fixed contacts 7a and 7b. The rod 9 is connected to the movable contact 8 and can move together with the movable contact 8 in the axial direction of the rod 9. The movable iron core 10 is made of a magnetic material, and the movable contact 8 is moved toward the fixed contacts 7a and 7b via the rod 9. The fixed iron core 11 is made of a magnetic material and is fixed to the main body of the starter electromagnetic switch device 2. The suction coil 12 generates a magnetic field that attracts the movable iron core 10 toward the fixed iron core 11. The holding coil 13 generates a magnetic field that holds the movable iron core 10 attracted to the fixed iron core 11 side at the moving end. The joint iron 14 is made of a magnetic material, and serves as a magnetic circuit of a magnetic field generated by the suction coil 12 and the holding coil 13. Although FIG. 4 shows an example in which the suction coil 12 and the holding coil 13 are composed of individual coils, these coils may be replaced with a single coil.

The starter electromagnetic switch device 2 includes a first switch cap 25 that internally accommodates fixed contacts 7a and 7b and a movable contact 8, and a second switch cap 26 that penetrates and fixes the motor terminal 7c and the battery terminal 7d. I have. In the starter electromagnetic switch device 2 of the present embodiment, the first switch cap 25 is made of an insulating thermosetting resin such as phenol resin, and the second switch cap 26 has a benzene ring in its molecular structure. It is composed of an insulating resin that does not contain the resin, for example, a polyamide resin and a cyclic aliphatic epoxy resin.

In the starter electromagnetic switch device 2 configured in this way, even if the starter is continuously used and the pair of fixed contacts 7 and the movable contacts 8 become hot, the first switch cap 25 that accommodates these contacts inside is 25. Is composed of a thermosetting resin having high heat resistance, so that the inside of the switch cap is not deformed or melted. Further, in the starter electromagnetic switch device 2, the second switch cap 26 that penetrates and fixes the motor terminal 7c and the battery terminal 7d is made of a resin having a highly tracking-resistant molecular structure and does not contain a benzene ring. Therefore, high tracking resistance can be obtained.

In the conventional electromagnetic switch device for a starter, the contacts are integrally molded with a thermosetting resin, and the contacts are housed inside by using one switch cap, and the motor terminal and the battery terminal are penetrated and fixed. On the other hand, in the electromagnetic switch device for a starter of the present embodiment, it is divided into a first switch cap 25 for accommodating contacts inside and a second switch cap 26 for penetrating and fixing the motor terminal 7c and the battery terminal 7d. is doing. The first switch cap 25 is made of a thermosetting resin having high heat resistance, and the second switch cap 26 is made of a resin having a molecular structure having high tracking resistance and does not contain a benzene ring. By configuring the switch cap in this way, a thermosetting resin having high heat resistance is arranged in a part where heat resistance is required, and a resin having high tracking resistance is arranged in a part where tracking resistance is required. Will be done. As a result, both tracking resistance and heat resistance can be achieved as a switch cap.

As described above, in the starter electromagnetic switch device of the present embodiment, the switch cap penetrates and fixes the first switch cap that houses the movable contact and the pair of fixed contacts, and the motor terminal and the battery terminal. It is equipped with two switch caps. Since the first switch cap is made of a thermosetting resin and the second switch cap is made of a resin whose molecular structure does not contain a benzene ring, both tracking resistance and heat resistance can be achieved at the same time.

The resin used for the second switch cap 26 may have a higher creep property than the thermosetting resin. In the starter electromagnetic switch device of the present embodiment, as shown in FIG. 4, metal bushes 30a and 30b having through holes in the second switch cap 26 may be integrally formed. A motor terminal 7c is inserted into the through hole of the metal bush 30a. The motor terminal 7c is tightened by the fastening member 31a and fixed to the metal bush 30a. Similarly, the battery terminal 7d is inserted into the through hole of the metal bush 30b. The battery terminal 7d is tightened by the fastening member 31b and fixed to the metal bush 30b.

In this way, the creep resistance of the second switch cap 26 can be improved by fixing the motor terminal 7c and the battery terminal 7d to the metal bush 30a and the metal bush 30b integrally molded with the second switch cap 26, respectively. ..

Embodiment 2.
In the starter electromagnetic switch device of the first embodiment, the second switch cap 26 is made of a resin whose molecular structure does not contain a benzene ring, for example, a polyamide resin which is a thermoplastic resin. In the starter electromagnetic switch device of the second embodiment, the second switch cap 26 is an insulating resin containing an element other than carbon in the main chain of the molecular structure, for example, a polyester resin, a modified polyphenylene ether resin, or a polybutylene terephthalate resin. , Amino resin, polyurethane resin, aromatic polyimide resin, polyphenylene sulfide resin (PPS resin) and the like. Polyester resin, modified polyphenylene ether resin and polybutylene terephthalate resin contain oxygen in the main chain. Amino resins, polyurethane resins and aromatic polyimide resins contain nitrogen in the main chain. The PPS resin contains sulfur in the main chain. Other than that, the configuration of the starter electromagnetic switch device of the present embodiment is the same as that of the starter electromagnetic switch device of the first embodiment.

Resins containing elements other than carbon such as oxygen, nitrogen, and sulfur in the main chain of the molecular structure have high tracking resistance. The starter electromagnetic switch device configured in this way can achieve both tracking resistance and heat resistance as in the first embodiment.

Embodiment 3.
FIG. 5 is a partial cross-sectional view of the starter electromagnetic switch device according to the third embodiment. The outer shape of the starter electromagnetic switch device 2 of the present embodiment is the same as the outer shape of the starter electromagnetic switch device of the first embodiment. Therefore, the partial cross-sectional view shown in FIG. 5 corresponds to the partial cross-sectional view taken along the line BB of the starter electromagnetic switch device of the first embodiment shown in FIG.

In the starter electromagnetic switch device 2 of the present embodiment, the auxiliary relay 24 is built in at a position sandwiched between the first switch cap 25 and the second switch cap 26. The materials of the first switch cap 25 and the second switch cap 26 of the starter electromagnetic switch device 2 of the present embodiment are the same as the materials shown in the first embodiment or the second embodiment. Further, the configuration of the electric circuit of the starter electromagnetic switch device 2 of the present embodiment is the same as the configuration of the electric circuit shown in FIG. 2 of the first embodiment.

As shown in FIG. 5, the auxiliary relay 24 includes a pair of auxiliary relay fixed contacts 15, auxiliary relay movable contacts 16, auxiliary relay movable iron core 17, auxiliary relay fixed iron core 18, auxiliary relay coil 19, auxiliary relay relay iron 20, and auxiliary. It includes a relay rod 21, an auxiliary relay return spring 22, and an auxiliary relay point spring 23. The auxiliary relay movable contact 16 constitutes an electric circuit that supplies electric power to the suction coil 12 and the holding coil 13 of the electromagnetic switch main body 2a by electrically connecting the pair of auxiliary relay fixed contacts 15 to each other. The auxiliary relay movable iron core 17 is made of a magnetic material, and the auxiliary relay movable contact 16 is moved in the direction of the pair of auxiliary relay fixed contacts 15. The auxiliary relay fixed iron core 18 is made of a magnetic material, and an attractive force is applied to the auxiliary relay movable iron core 17. The auxiliary relay coil 19 generates a magnetomotive force that is a source of attractive force with respect to the auxiliary relay movable iron core 17 of the auxiliary relay fixed iron core 18. The auxiliary relay relay 20 forms a magnetic circuit by excitation by energization of the auxiliary relay coil 19. The auxiliary relay rod 21 is connected to the auxiliary relay movable contact 16. Here, when the auxiliary relay coil 19 is not energized and no attractive force is generated for the auxiliary relay movable iron core 17, it is referred to as a non-excited state, and the auxiliary relay coil 19 is energized for the auxiliary relay movable iron core 17. The time when the attractive force is generated is called the excited state. The auxiliary relay return spring 22 holds the auxiliary relay movable contact 16 at a position away from the auxiliary relay fixed contact 15 via the auxiliary relay movable iron core 17 and the auxiliary relay rod 21 in a non-excited state. The auxiliary relay point spring 23 holds the auxiliary relay movable contact 16 at a position in contact with the auxiliary relay fixed contact 15 in the excited state.

FIG. 6 is an exploded view of the starter electromagnetic switch device 2 of the present embodiment, and FIG. 7 is an external view of the starter electromagnetic switch device 2 of the present embodiment. As shown in FIG. 6, an auxiliary relay storage chamber 27 is formed in the first switch cap 25, and the auxiliary relay 24 is housed in the auxiliary relay storage chamber 27. The auxiliary relay storage chamber 27 is separated from the contact chamber 28 in which the pair of fixed contacts 7 and the movable contacts 8 are housed by a partition wall.

The end face of the first switch cap 25 having the auxiliary relay storage chamber 27 and the end face of the second switch cap 26 are arranged so as to face each other, and a packing 29 made of an elastic material is arranged between the two end faces. .. As shown in FIG. 7, the first switch cap 25 and the second switch cap 26 are fixed by compressing the packing 29 by tightening the motor terminal 7c and the battery terminal 7d with the fastening members 31a and 31b.

The starter electromagnetic switch device configured in this way can achieve both tracking resistance and heat resistance, as in the first and second embodiments. Further, in this starter electromagnetic switch device, the auxiliary relay is sandwiched between the first switch cap and the second switch cap, and the auxiliary relay can be built in, so that excellent layout can be obtained.

Although the present application describes various exemplary embodiments, the various features, embodiments, and functions described in one or more embodiments are limited to the application of the particular embodiment. Rather, it can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed in the present application. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

B Battery, SS key switch, CA control device, 1 starter, 2 Electromagnetic switch device for starter, 2a Electromagnetic switch body, 3 motor, 4 shift lever, 5 shaft, 6 pinion, 7 pair of fixed contacts, 7a, 7b fixed contacts , 7c motor terminal, 7d battery terminal, 8 movable contact, 9 rod, 10 movable iron core, 11 fixed iron core, 12 suction coil, 13 holding coil, 14 relay, 15 auxiliary relay fixed contact, 16 auxiliary relay movable contact, 17 auxiliary Relay movable iron core, 18 auxiliary relay fixed iron core, 19 auxiliary relay coil, 20 auxiliary relay relay, 21 auxiliary relay rod, 22 auxiliary relay return spring, 23 auxiliary relay point spring, 24 auxiliary relay, 25 1st switch cap, 26th 2 switch cap, 27 auxiliary relay storage chamber, 28 contact chamber, 29 packing, 30a, 30b metal bush, 31a, 31b fastening member

Claims (3)

A pair of fixed contacts arranged apart from each other,
A movable contact that contacts the pair of the fixed contacts based on the start signal and electrically connects the pair of the fixed contacts.
A motor terminal connected to the fixed contact of one of the pair of fixed contacts,
A battery terminal connected to the other fixed contact of the pair of fixed contacts,
A first switch cap that internally accommodates the movable contact and the pair of fixed contacts,
An electromagnetic switch device for a starter provided with a second switch cap that penetrates and fixes the motor terminal and the battery terminal.
The first switch cap is made of a thermosetting resin, and the second switch cap is a polyamide resin, an aromatic polyimide resin, a cyclic aliphatic epoxy resin, a polyester resin, a modified polyphenylene ether resin, an amino resin, and a polyurethane resin. An electromagnetic switch device for a starter, which is composed of at least one resin selected from the group consisting of polybutylene terephthalate resin and polyphenylene sulfide resin. The electromagnetic switch device for a starter according to claim 1, wherein the second switch cap includes a metal bush through which the motor terminal and the battery terminal penetrate. An auxiliary relay for operating the movable contact based on the start signal is further provided, and the auxiliary relay is housed in an auxiliary relay storage chamber formed at a position sandwiched between the first switch cap and the second switch cap. The electromagnetic switch device for a starter according to claim 1 or 2.

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